\centering
\begin{tabular}[t]{lccc}
\toprule
\multicolumn{1}{c}{ } & \multicolumn{3}{c}{\makecell[c]{Dep var: Chose trans worker (=1)\\(pairs with trans only)}} \\
\cmidrule(l{3pt}r{3pt}){2-4}
\multicolumn{1}{c}{ } & \multicolumn{1}{c}{Trans dominates} & \multicolumn{1}{c}{Trans is dominated} & \multicolumn{1}{c}{Neither dominates} \\
\cmidrule(l{3pt}r{3pt}){2-2} \cmidrule(l{3pt}r{3pt}){3-3} \cmidrule(l{3pt}r{3pt}){4-4}
  & (1) & (2) & (3)\\
\midrule
3-person discussion & \num{0.175}*** & \num{0.127}*** & \num{0.179}***\\
 & (\num{0.031}) [\num{<0.001}] & (\num{0.032}) [\num{<0.001}] & (\num{0.026}) [\num{<0.001}]\\
\midrule
Num. observations & \num{1088} & \num{1185} & \num{2225}\\
Num. participants & \num{960} & \num{1063} & \num{1721}\\
Num. groups & \num{600} & \num{628} & \num{735}\\
Outcome mean: no discuss (priv.), worker trans & \num{0.53} & \num{0.35} & \num{0.40}\\
Controls & X & X & X\\
\bottomrule

\end{tabular}

